| 초록 |
In this research, we explained CO2 absorption and desorption of solid- (A2CO3; A=Na, K, Rb, and Cs) and liquid- ((Li0.435Na0.315K0.25)2CO3) state alkali carbonate-promoted MgO absorbents. These two types of CO2 absorbent have same two-step absorption behavior, but details are different depending on the state of the promoter at the operating condition. Liquid alkali carbonate-promoted MgO absorbent shows improved MgO conversion and kinetics than solid alkali carbonate-promoted MgO absorbent. Liquid alkali carbonate provides reaction medium for MgO and CO2 and facilitates the CO2 absorption like alkali nitrate-promoted MgO absorbent. Whereas, there is no reaction medium in solid alkali carbonate-promoted MgO. CO2 absorption of solid alkali carbonate-promoted MgO absorbent occurs at the interface between A2CO3 and MgO. Additionally, we find the phase of the carbonated product is different from the phase of the promoter. Detailed data and their explanation will be presented in the poster session. |
